泰国-老挝黎府构造带晚泥盆世-早石炭世放射虫动物群及其地质意义

LATE DEVONIAN—EARLY CARBONIFEROUS RADIOLARIAN FAUNA FROM LOEI FOLD BELT IN THAILAND AND LAOS AND ITS GEOLOGICAL IMPLICATIONS

本文对老挝西北部和泰国东北部黎府构造带6个层状硅质岩考察点进行了放射虫化石调查研究,其中有5个点发现可供鉴定的放射虫化石,共鉴定放射虫化石9属23种,包括典型的晚泥盆世放射虫化石Helenifore robustum和早石炭世放射虫化石Albaillella cartalla,Al.undula,Al.paradoxa等,5个层状硅质岩考察点地质时代类似,为晚泥盆世至早石炭世。该调查成果表明,黎府构造带从泰国东北部延续到了老挝西北部万荣地区,其深海盆地演化历史应该在早石炭世晚期结束。

This paper studied 6 outcrops composed by bedded cherts in the Loei Fold Belt in the northwest Laos and northeast Thailand. Twenty-four species of well-preserved radiolarians from the Upper Devonian to the Lower Carboniferous have been identified, including typical Late Devonian Helenifore robustum and Early Carboniferous Albaillella cartalla, Al. undula, Al. paradoxa and others. This is a first report about the Late Devonian-Early Carboni-ferous radiolarians from the Loei Fold Belt, which indicates that the belt extends from NE Thailand to NW Laos and that the pelagic basin represented by the Loei Fold Belt closed in late Early Carboniferous in both areas.